What Is SEER Rating? — AC Efficiency Explained
SEER stands for Seasonal Energy Efficiency Ratio — a standardized measurement of how efficiently an air conditioner converts electricity into cooling over an entire cooling season. The higher the SEER rating, the more efficient the system and the lower your energy bills. In Houston, where cooling accounts for 50-70% of summer electricity costs, SEER ratings have a significant financial impact.
How SEER Is Calculated
SEER is calculated by dividing the total cooling output (measured in BTUs) over a typical cooling season by the total electrical energy input (in watt-hours) during that same period. It's a seasonal average, not a peak measurement — so it accounts for varying outdoor temperatures throughout the cooling season. A 16 SEER system produces 16 BTUs of cooling for every watt-hour of electricity consumed.
SEER vs. SEER2: What Changed
In January 2023, the DOE introduced SEER2, a new testing methodology that uses higher static pressure to better reflect real-world duct conditions. SEER2 numbers are approximately 4.7% lower than the equivalent SEER rating. The new minimum standard for Houston (South region) is **15 SEER2** (equivalent to about 15.7 old SEER). When comparing systems, make sure you're comparing the same rating type.
What SEER Rating Do You Need in Houston?
The federal minimum for the South region (including Houston) is 15 SEER2. We recommend **16-18 SEER2** for most Houston homeowners as the sweet spot between upfront cost and long-term savings. Higher ratings (20+ SEER2) offer maximum savings but the added upfront cost takes longer to recoup. With Houston's 7-month cooling season, higher-SEER systems reach their payback point faster than in milder climates.
SEER Impact on Energy Bills
Upgrading from a 10 SEER system (common in pre-2006 homes) to a 16 SEER2 system reduces cooling energy consumption by approximately 37%. For the average Houston home spending $250/month on summer cooling, that's roughly $90/month in savings — or about $630 during the 7-month cooling season. Over a 15-year system life, that's nearly $10,000 in energy savings.
Frequently Asked Questions
What is a good SEER rating for Houston?+
Is a higher SEER rating always better?+
What's the difference between SEER and SEER2?+
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Expert-Reviewed — What Is SEER Rating? — AC Efficiency Explained
David Chen
Senior Service Technician
David is a Daikin D1-certified installer with 14 years of hands-on experience in residential and light commercial HVAC. He has completed over 2,000 system installations across Greater Houston and is known for precise Manual J load calculations and optimal system sizing.
"David explained everything clearly and installed our new system perfectly. Runs quieter than expected."
— Verified Customer
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